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Easy measuring: At 16.67 mg/mL, 1 U-100 unit = 0.01 mL = approximately 166.7 mcg

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Medication fluid amounts up to 0.5-1 mL can be injected in one site in infants and children, whereas adults can tolerate 2-3 mL

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Best Time to Take Vitamin B12 Supplements The optimal timing for vitamin B12 supplementation depends on individual circumstances, the formulation used, and personal tolerance